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Inclusion and exclusion criteria.
| Inclusion criteria | Exclusion criteria |
|---|---|
| Undergoing fresh or frozen single blastocyst ET | Known or suspected hydrosalpinx |
| Able to provide written informed consent | Fluid within the endometrial cavity |
| Gross distortion of endometrium (e.g. fibroids, bicornuate uteri) | |
| Previous myomectomy | |
| Previous randomisation | |
| Significant health issues, e.g. HIV, Hepatitis C, Hepatitis B, previous trachelectomy | |
| > 1 embryo transferred |
